CVE-2026-54450 (GCVE-0-2026-54450)
Vulnerability from cvelistv5
Published
2026-09-15 15:47
Modified
2026-09-15 16:13
CWE
  • CWE-918 - Server-Side Request Forgery (SSRF)
Summary
ToolHive is a utility designed to simplify the deployment and management of Model Context Protocol (MCP) servers. Prior to 0.29.1, networking.IsPrivateIP in pkg/networking/utilities.go omits the IPv6 NAT64 prefixes 64:ff9b::/96 and 64:ff9b:1::/48, so NAT64 addresses embedding private, loopback, or link-local IPv4 targets are classified as public and allowed. The most direct attacker-controlled path begins when an external OAuth client supplies a client_id URL that CIMDStorageDecorator.GetClient routes through FetchClientMetadataDocument in pkg/oauthproto/cimd/fetch.go; protectedDialerControl in pkg/networking/http_client.go and validateHost in pkg/skills/gitresolver/reference.go share the defective classification but use operator-controlled or user-controlled destinations. On a ToolHive host behind a NAT64/DNS64 gateway, the gateway translates an allowed address such as 64:ff9b:1::a9fe:a9fe to 169.254.169.254, permitting blind probing of internal TCP or TLS reachability. The attacker-controlled CIMD path requires HTTPS, verifies certificates, and does not reflect response bodies, so the established impact is an internal reachability oracle rather than metadata credential exfiltration; the webhook client is not affected because it does not use this IP guard. This issue is fixed in version 0.29.1.
Impacted products
Vendor Product Version
stacklok toolhive Version: < 0.29.1
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Show details on NVD website


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                "timestamp": "2026-09-15T16:12:58.689222Z",
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      "source": {
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        "discovery": "UNKNOWN"
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  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
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